Improved machine for drilling rocks



NITED STATES PATENT GFFICE.

CHARLES BURLEIGH, OF FITCHBURG, MASSACHUSETTS.

IMPROVED MACHINE FOR DRILLING ROCKS.

To all whom it may concern:

Be it known that I, CHARLES BURLEIGH, of Fitchburg, in the county of Worcester and State ot1 Massachusetts, have invented certain new and useful Improvements in Machinery for Drilling Rocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, malring part of this specification, in which.-

Figure l is an elevation of one side ot' ,my improved machine for drilling rocks. Fig. 2 is a transverse section through the same on the line x a of Fig. l.

My invention consists in combining two or more cylinders with the drill or drill-holder, which is placed outside the cylinders and connected with their piston-rods, the power of Awhich is thus made to act simultaneously tov drive the drill, by which construction the drill or drill-holder is brought nearer to the center ot' the support of the machine than where the drill or its holder passes through a hollow piston-rod, which requires a cylinder of larger diameter, and consequently carries the drill or its holder farther from the center of the support, rendering it less steady while in op- The piston-robs b c of the cylinders A B are connected together bya cross-head, F, in which revolves the short hollow shaft G, through which passes the drill-holder D.

The manner of rotating the drill and feeding it forward, as well as the method of operating the valves of the cylinders, forming no part of my present invention, will not be here described.

The piston-rods b c through the crosshead F are thus made to act simultaneously on the drill-holder, which, being placed between the cylinders, enables me to make the cylinders ot' smaller diameter than where the drill or its holder passes through a hollow piston-rod, by which construction the drill or its holder can be brought much nearer to the center of the support to which the machine is attached, thus rendering the whole more steady and firm While in operation. The drill-holder, being placed outside the cylinders, is rotated independently of the piston-rods, thus avoiding the necessity ot' rotating the piston and .piston-rod within the cylinder, as heretofore.

Instead of two cylinders being employed, as shown, three or more cylinders may be arranged together and their piston-rods connected to the drill or drill-holder, so as to act simultaneously on it without departing from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination oi' two or more cylinders with the drill or drill-holder, operating substantially' as described, for the purpose set forth.

CHARLES BURLEIGH.

Witnesses:

P. E. TEsCHEMAcHER, N. W. STEARNs. 

